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<FONT color="green">001</FONT>    package org.bukkit.util.noise;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.util.Random;<a name="line.3"></a>
<FONT color="green">004</FONT>    import org.bukkit.World;<a name="line.4"></a>
<FONT color="green">005</FONT>    <a name="line.5"></a>
<FONT color="green">006</FONT>    /**<a name="line.6"></a>
<FONT color="green">007</FONT>     * Generates noise using the "classic" perlin generator<a name="line.7"></a>
<FONT color="green">008</FONT>     * <a name="line.8"></a>
<FONT color="green">009</FONT>     * @see SimplexNoiseGenerator "Improved" and faster version with slighly different results<a name="line.9"></a>
<FONT color="green">010</FONT>     */<a name="line.10"></a>
<FONT color="green">011</FONT>    public class PerlinNoiseGenerator extends NoiseGenerator {<a name="line.11"></a>
<FONT color="green">012</FONT>        protected static final int grad3[][] = {{1, 1, 0}, {-1, 1, 0}, {1, -1, 0}, {-1, -1, 0},<a name="line.12"></a>
<FONT color="green">013</FONT>            {1, 0, 1}, {-1, 0, 1}, {1, 0, -1}, {-1, 0, -1},<a name="line.13"></a>
<FONT color="green">014</FONT>            {0, 1, 1}, {0, -1, 1}, {0, 1, -1}, {0, -1, -1}};<a name="line.14"></a>
<FONT color="green">015</FONT>        private static final PerlinNoiseGenerator instance = new PerlinNoiseGenerator();<a name="line.15"></a>
<FONT color="green">016</FONT>    <a name="line.16"></a>
<FONT color="green">017</FONT>        protected PerlinNoiseGenerator() {<a name="line.17"></a>
<FONT color="green">018</FONT>            int p[] = {151, 160, 137, 91, 90, 15, 131, 13, 201,<a name="line.18"></a>
<FONT color="green">019</FONT>                95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8, 99, 37,<a name="line.19"></a>
<FONT color="green">020</FONT>                240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62,<a name="line.20"></a>
<FONT color="green">021</FONT>                94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56,<a name="line.21"></a>
<FONT color="green">022</FONT>                87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134, 139,<a name="line.22"></a>
<FONT color="green">023</FONT>                48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133,<a name="line.23"></a>
<FONT color="green">024</FONT>                230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, 65, 25,<a name="line.24"></a>
<FONT color="green">025</FONT>                63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200,<a name="line.25"></a>
<FONT color="green">026</FONT>                196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3,<a name="line.26"></a>
<FONT color="green">027</FONT>                64, 52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255,<a name="line.27"></a>
<FONT color="green">028</FONT>                82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42,<a name="line.28"></a>
<FONT color="green">029</FONT>                223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153,<a name="line.29"></a>
<FONT color="green">030</FONT>                101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79,<a name="line.30"></a>
<FONT color="green">031</FONT>                113, 224, 232, 178, 185, 112, 104, 218, 246, 97, 228, 251, 34, 242,<a name="line.31"></a>
<FONT color="green">032</FONT>                193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249,<a name="line.32"></a>
<FONT color="green">033</FONT>                14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204,<a name="line.33"></a>
<FONT color="green">034</FONT>                176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222,<a name="line.34"></a>
<FONT color="green">035</FONT>                114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180};<a name="line.35"></a>
<FONT color="green">036</FONT>    <a name="line.36"></a>
<FONT color="green">037</FONT>            for (int i = 0; i &lt; 512; i++) {<a name="line.37"></a>
<FONT color="green">038</FONT>                perm[i] = p[i &amp; 255];<a name="line.38"></a>
<FONT color="green">039</FONT>            }<a name="line.39"></a>
<FONT color="green">040</FONT>        }<a name="line.40"></a>
<FONT color="green">041</FONT>    <a name="line.41"></a>
<FONT color="green">042</FONT>        /**<a name="line.42"></a>
<FONT color="green">043</FONT>         * Creates a seeded perlin noise generator for the given world<a name="line.43"></a>
<FONT color="green">044</FONT>         *<a name="line.44"></a>
<FONT color="green">045</FONT>         * @param world World to construct this generator for<a name="line.45"></a>
<FONT color="green">046</FONT>         */<a name="line.46"></a>
<FONT color="green">047</FONT>        public PerlinNoiseGenerator(World world) {<a name="line.47"></a>
<FONT color="green">048</FONT>            this(new Random(world.getSeed()));<a name="line.48"></a>
<FONT color="green">049</FONT>        }<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>        /**<a name="line.51"></a>
<FONT color="green">052</FONT>         * Creates a seeded perlin noise generator for the given seed<a name="line.52"></a>
<FONT color="green">053</FONT>         *<a name="line.53"></a>
<FONT color="green">054</FONT>         * @param seed Seed to construct this generator for<a name="line.54"></a>
<FONT color="green">055</FONT>         */<a name="line.55"></a>
<FONT color="green">056</FONT>        public PerlinNoiseGenerator(long seed) {<a name="line.56"></a>
<FONT color="green">057</FONT>            this(new Random(seed));<a name="line.57"></a>
<FONT color="green">058</FONT>        }<a name="line.58"></a>
<FONT color="green">059</FONT>    <a name="line.59"></a>
<FONT color="green">060</FONT>        /**<a name="line.60"></a>
<FONT color="green">061</FONT>         * Creates a seeded perlin noise generator with the given Random<a name="line.61"></a>
<FONT color="green">062</FONT>         *<a name="line.62"></a>
<FONT color="green">063</FONT>         * @param rand Random to construct with<a name="line.63"></a>
<FONT color="green">064</FONT>         */<a name="line.64"></a>
<FONT color="green">065</FONT>        public PerlinNoiseGenerator(Random rand) {<a name="line.65"></a>
<FONT color="green">066</FONT>            offsetX = rand.nextDouble() * 256;<a name="line.66"></a>
<FONT color="green">067</FONT>            offsetY = rand.nextDouble() * 256;<a name="line.67"></a>
<FONT color="green">068</FONT>            offsetZ = rand.nextDouble() * 256;<a name="line.68"></a>
<FONT color="green">069</FONT>    <a name="line.69"></a>
<FONT color="green">070</FONT>            for (int i = 0; i &lt; 256; i++) {<a name="line.70"></a>
<FONT color="green">071</FONT>                perm[i] = i;<a name="line.71"></a>
<FONT color="green">072</FONT>            }<a name="line.72"></a>
<FONT color="green">073</FONT>    <a name="line.73"></a>
<FONT color="green">074</FONT>            for (int i = 0; i &lt; 256; i++) {<a name="line.74"></a>
<FONT color="green">075</FONT>                int pos = rand.nextInt(256 - i) + i;<a name="line.75"></a>
<FONT color="green">076</FONT>                int old = perm[i];<a name="line.76"></a>
<FONT color="green">077</FONT>    <a name="line.77"></a>
<FONT color="green">078</FONT>                perm[i] = perm[pos];<a name="line.78"></a>
<FONT color="green">079</FONT>                perm[pos] = old;<a name="line.79"></a>
<FONT color="green">080</FONT>                perm[i + 256] = perm[i];<a name="line.80"></a>
<FONT color="green">081</FONT>            }<a name="line.81"></a>
<FONT color="green">082</FONT>        }<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>        /**<a name="line.84"></a>
<FONT color="green">085</FONT>         * Computes and returns the 1D unseeded perlin noise for the given coordinates in 1D space<a name="line.85"></a>
<FONT color="green">086</FONT>         *<a name="line.86"></a>
<FONT color="green">087</FONT>         * @param x X coordinate<a name="line.87"></a>
<FONT color="green">088</FONT>         * @return Noise at given location, from range -1 to 1<a name="line.88"></a>
<FONT color="green">089</FONT>         */<a name="line.89"></a>
<FONT color="green">090</FONT>        public static double getNoise(double x) {<a name="line.90"></a>
<FONT color="green">091</FONT>            return instance.noise(x);<a name="line.91"></a>
<FONT color="green">092</FONT>        }<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>        /**<a name="line.94"></a>
<FONT color="green">095</FONT>         * Computes and returns the 2D unseeded perlin noise for the given coordinates in 2D space<a name="line.95"></a>
<FONT color="green">096</FONT>         *<a name="line.96"></a>
<FONT color="green">097</FONT>         * @param x X coordinate<a name="line.97"></a>
<FONT color="green">098</FONT>         * @param y Y coordinate<a name="line.98"></a>
<FONT color="green">099</FONT>         * @return Noise at given location, from range -1 to 1<a name="line.99"></a>
<FONT color="green">100</FONT>         */<a name="line.100"></a>
<FONT color="green">101</FONT>        public static double getNoise(double x, double y) {<a name="line.101"></a>
<FONT color="green">102</FONT>            return instance.noise(x, y);<a name="line.102"></a>
<FONT color="green">103</FONT>        }<a name="line.103"></a>
<FONT color="green">104</FONT>    <a name="line.104"></a>
<FONT color="green">105</FONT>        /**<a name="line.105"></a>
<FONT color="green">106</FONT>         * Computes and returns the 3D unseeded perlin noise for the given coordinates in 3D space<a name="line.106"></a>
<FONT color="green">107</FONT>         *<a name="line.107"></a>
<FONT color="green">108</FONT>         * @param x X coordinate<a name="line.108"></a>
<FONT color="green">109</FONT>         * @param y Y coordinate<a name="line.109"></a>
<FONT color="green">110</FONT>         * @param z Z coordinate<a name="line.110"></a>
<FONT color="green">111</FONT>         * @return Noise at given location, from range -1 to 1<a name="line.111"></a>
<FONT color="green">112</FONT>         */<a name="line.112"></a>
<FONT color="green">113</FONT>        public static double getNoise(double x, double y, double z) {<a name="line.113"></a>
<FONT color="green">114</FONT>            return instance.noise(x, y, z);<a name="line.114"></a>
<FONT color="green">115</FONT>        }<a name="line.115"></a>
<FONT color="green">116</FONT>    <a name="line.116"></a>
<FONT color="green">117</FONT>        /**<a name="line.117"></a>
<FONT color="green">118</FONT>         * Gets the singleton unseeded instance of this generator<a name="line.118"></a>
<FONT color="green">119</FONT>         *<a name="line.119"></a>
<FONT color="green">120</FONT>         * @return Singleton<a name="line.120"></a>
<FONT color="green">121</FONT>         */<a name="line.121"></a>
<FONT color="green">122</FONT>        public static PerlinNoiseGenerator getInstance() {<a name="line.122"></a>
<FONT color="green">123</FONT>            return instance;<a name="line.123"></a>
<FONT color="green">124</FONT>        }<a name="line.124"></a>
<FONT color="green">125</FONT>    <a name="line.125"></a>
<FONT color="green">126</FONT>        @Override<a name="line.126"></a>
<FONT color="green">127</FONT>        public double noise(double x, double y, double z) {<a name="line.127"></a>
<FONT color="green">128</FONT>            x += offsetX;<a name="line.128"></a>
<FONT color="green">129</FONT>            y += offsetY;<a name="line.129"></a>
<FONT color="green">130</FONT>            z += offsetZ;<a name="line.130"></a>
<FONT color="green">131</FONT>    <a name="line.131"></a>
<FONT color="green">132</FONT>            int floorX = floor(x);<a name="line.132"></a>
<FONT color="green">133</FONT>            int floorY = floor(y);<a name="line.133"></a>
<FONT color="green">134</FONT>            int floorZ = floor(z);<a name="line.134"></a>
<FONT color="green">135</FONT>    <a name="line.135"></a>
<FONT color="green">136</FONT>            // Find unit cube containing the point<a name="line.136"></a>
<FONT color="green">137</FONT>            int X = floorX &amp; 255;<a name="line.137"></a>
<FONT color="green">138</FONT>            int Y = floorY &amp; 255;<a name="line.138"></a>
<FONT color="green">139</FONT>            int Z = floorZ &amp; 255;<a name="line.139"></a>
<FONT color="green">140</FONT>    <a name="line.140"></a>
<FONT color="green">141</FONT>            // Get relative xyz coordinates of the point within the cube<a name="line.141"></a>
<FONT color="green">142</FONT>            x -= floorX;<a name="line.142"></a>
<FONT color="green">143</FONT>            y -= floorY;<a name="line.143"></a>
<FONT color="green">144</FONT>            z -= floorZ;<a name="line.144"></a>
<FONT color="green">145</FONT>    <a name="line.145"></a>
<FONT color="green">146</FONT>            // Compute fade curves for xyz<a name="line.146"></a>
<FONT color="green">147</FONT>            double fX = fade(x);<a name="line.147"></a>
<FONT color="green">148</FONT>            double fY = fade(y);<a name="line.148"></a>
<FONT color="green">149</FONT>            double fZ = fade(z);<a name="line.149"></a>
<FONT color="green">150</FONT>    <a name="line.150"></a>
<FONT color="green">151</FONT>            // Hash coordinates of the cube corners<a name="line.151"></a>
<FONT color="green">152</FONT>            int A = perm[X] + Y;<a name="line.152"></a>
<FONT color="green">153</FONT>            int AA = perm[A] + Z;<a name="line.153"></a>
<FONT color="green">154</FONT>            int AB = perm[A + 1] + Z;<a name="line.154"></a>
<FONT color="green">155</FONT>            int B = perm[X + 1] + Y;<a name="line.155"></a>
<FONT color="green">156</FONT>            int BA = perm[B] + Z;<a name="line.156"></a>
<FONT color="green">157</FONT>            int BB = perm[B + 1] + Z;<a name="line.157"></a>
<FONT color="green">158</FONT>    <a name="line.158"></a>
<FONT color="green">159</FONT>            return lerp(fZ, lerp(fY, lerp(fX, grad(perm[AA], x, y, z),<a name="line.159"></a>
<FONT color="green">160</FONT>                            grad(perm[BA], x - 1, y, z)),<a name="line.160"></a>
<FONT color="green">161</FONT>                        lerp(fX, grad(perm[AB], x, y - 1, z),<a name="line.161"></a>
<FONT color="green">162</FONT>                            grad(perm[BB], x - 1, y - 1, z))),<a name="line.162"></a>
<FONT color="green">163</FONT>                    lerp(fY, lerp(fX, grad(perm[AA + 1], x, y, z - 1),<a name="line.163"></a>
<FONT color="green">164</FONT>                            grad(perm[BA + 1], x - 1, y, z - 1)),<a name="line.164"></a>
<FONT color="green">165</FONT>                        lerp(fX, grad(perm[AB + 1], x, y - 1, z - 1),<a name="line.165"></a>
<FONT color="green">166</FONT>                            grad(perm[BB + 1], x - 1, y - 1, z - 1))));<a name="line.166"></a>
<FONT color="green">167</FONT>        }<a name="line.167"></a>
<FONT color="green">168</FONT>    <a name="line.168"></a>
<FONT color="green">169</FONT>        /**<a name="line.169"></a>
<FONT color="green">170</FONT>         * Generates noise for the 1D coordinates using the specified number of octaves and parameters<a name="line.170"></a>
<FONT color="green">171</FONT>         *<a name="line.171"></a>
<FONT color="green">172</FONT>         * @param x X-coordinate<a name="line.172"></a>
<FONT color="green">173</FONT>         * @param octaves Number of octaves to use<a name="line.173"></a>
<FONT color="green">174</FONT>         * @param frequency How much to alter the frequency by each octave<a name="line.174"></a>
<FONT color="green">175</FONT>         * @param amplitude How much to alter the amplitude by each octave<a name="line.175"></a>
<FONT color="green">176</FONT>         * @return Resulting noise<a name="line.176"></a>
<FONT color="green">177</FONT>         */<a name="line.177"></a>
<FONT color="green">178</FONT>        public static double getNoise(double x, int octaves, double frequency, double amplitude) {<a name="line.178"></a>
<FONT color="green">179</FONT>            return instance.noise(x, octaves, frequency, amplitude);<a name="line.179"></a>
<FONT color="green">180</FONT>        }<a name="line.180"></a>
<FONT color="green">181</FONT>    <a name="line.181"></a>
<FONT color="green">182</FONT>        /**<a name="line.182"></a>
<FONT color="green">183</FONT>         * Generates noise for the 2D coordinates using the specified number of octaves and parameters<a name="line.183"></a>
<FONT color="green">184</FONT>         *<a name="line.184"></a>
<FONT color="green">185</FONT>         * @param x X-coordinate<a name="line.185"></a>
<FONT color="green">186</FONT>         * @param y Y-coordinate<a name="line.186"></a>
<FONT color="green">187</FONT>         * @param octaves Number of octaves to use<a name="line.187"></a>
<FONT color="green">188</FONT>         * @param frequency How much to alter the frequency by each octave<a name="line.188"></a>
<FONT color="green">189</FONT>         * @param amplitude How much to alter the amplitude by each octave<a name="line.189"></a>
<FONT color="green">190</FONT>         * @return Resulting noise<a name="line.190"></a>
<FONT color="green">191</FONT>         */<a name="line.191"></a>
<FONT color="green">192</FONT>        public static double getNoise(double x, double y, int octaves, double frequency, double amplitude) {<a name="line.192"></a>
<FONT color="green">193</FONT>            return instance.noise(x, y, octaves, frequency, amplitude);<a name="line.193"></a>
<FONT color="green">194</FONT>        }<a name="line.194"></a>
<FONT color="green">195</FONT>    <a name="line.195"></a>
<FONT color="green">196</FONT>        /**<a name="line.196"></a>
<FONT color="green">197</FONT>         * Generates noise for the 3D coordinates using the specified number of octaves and parameters<a name="line.197"></a>
<FONT color="green">198</FONT>         *<a name="line.198"></a>
<FONT color="green">199</FONT>         * @param x X-coordinate<a name="line.199"></a>
<FONT color="green">200</FONT>         * @param y Y-coordinate<a name="line.200"></a>
<FONT color="green">201</FONT>         * @param z Z-coordinate<a name="line.201"></a>
<FONT color="green">202</FONT>         * @param octaves Number of octaves to use<a name="line.202"></a>
<FONT color="green">203</FONT>         * @param frequency How much to alter the frequency by each octave<a name="line.203"></a>
<FONT color="green">204</FONT>         * @param amplitude How much to alter the amplitude by each octave<a name="line.204"></a>
<FONT color="green">205</FONT>         * @return Resulting noise<a name="line.205"></a>
<FONT color="green">206</FONT>         */<a name="line.206"></a>
<FONT color="green">207</FONT>        public static double getNoise(double x, double y, double z, int octaves, double frequency, double amplitude) {<a name="line.207"></a>
<FONT color="green">208</FONT>            return instance.noise(x, y, z, octaves, frequency, amplitude);<a name="line.208"></a>
<FONT color="green">209</FONT>        }<a name="line.209"></a>
<FONT color="green">210</FONT>    }<a name="line.210"></a>




























































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